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Threads Tagged with p0421

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audi s5 2011 v8 4.2l, p0421, p0431, p0441, vapor canister valve

Another P0421 code... Audi S5 2011 V8 4.2L

Audi.S5.2011.V8 on 10-12-2022

10-12-2022 05:49 PM
by Audi.S5.2011.V8

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0

1,121

03, 30, a6, audi, catalyst, code, ecu, error, p0421, p0431, po421, po431, software, update, warm

Warm Up Catalyst Efficiency P0421, P0431

Euge82 on 03-15-2013

09-16-2014 10:10 AM
by ppgoal

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6

24,773

02, a6, audi, bank, catalyst, check, engine, fouler, gmc, p0421, sierra, threshhold, threshold, trick, warm, warmup

Warm-Up Catalyst Below Threshold (PO421/31)

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Multi-page thread

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Spotty on 02-08-2010

03-25-2014 09:53 PM
by mcgregor32000

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17

60,524

04, 30, a4, a6, audi, bank, bars, base, carrier, cat, code, missan, murano, p0421, quattro

Code #P0421. Please help.

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Multi-page thread

1 2 3)

john@astigracing.com on 12-23-2009

01-14-2014 09:10 AM
by cwilson

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24

22,003

a4, audi, b6, p0421, p0431, stop

P0421 & P0431 for years...

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Multi-page thread

1 2)

brewder on 08-13-2013

11-23-2013 01:17 PM
by brewder

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10

21,204

0701, 2000, 2003, a4, a6, audi, code, fail, failsafe, intermittent, mode, p0421, p0431, safe, tiptronic, trans, transmission

Transmission/Tiptronic FAIL-SAFE or BACKUP MODES

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Multi-page thread

1 2 3 ... Last Page)

soinclined on 08-24-2004

08-09-2013 05:54 PM
by arielista

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31

50,933

audi, p0421, p1177

Vacuum Leak? codes p0306, p0421, p1177

nismo350z_burak_tx on 08-06-2013

08-07-2013 09:54 AM
by twopedalwarrior

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1

2,387

0421, 2002, a4, audi, car, code, codes, fault, location, p0346, p0421, p0421p0431, p0431, p0741, pass

DTC codes P0421/P0431, needs new cats!

existence1000 on 04-06-2013

04-08-2013 12:47 AM
by existence1000

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3

10,907

1999, 2000, 2001, a4, a6, audi, cel, code, cure, maf, p0421, p1127, p1129, replaced, s4

01 S4 - P0421, P1127, P1129 - Need Help!

titanko on 06-22-2010

01-25-2013 08:45 AM
by titanko

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8

16,711

S Car Model Line

01, 0431, 2001, a4, aftermarket, allroad, audi, b5, code, exhaust, intake, leak, p0421, p0431, s4

P0431 and P0421

TheCounty on 12-03-2012

12-03-2012 09:12 PM
by TheCounty

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0

10,989

2003, a4, audi, code, disappears, engine, light, p0421, reading

P0421....Take a look PLEASE!!!

2003audiA4avant on 07-10-2012

07-10-2012 04:00 PM
by 2003audiA4avant

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1

4,402

02, 30, a4, audi, avk, b1, b2, b6, diy, location, oxygen, p0421, p0431, sensor, sensors

02 sensor location on 3.0

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Multi-page thread

1 2)

simsaudi3.0 on 02-02-2008

05-17-2012 09:44 AM
by jlbpower

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13

50,261

2002, 30, a4, audi, bank, cat, check, code, dtc, engine, light, obd2, p0421, p0431, po421, quattro

2002 A4 3.0 Quattro DTC P0421/P0431

AnthonyVas79 on 03-17-2012

04-08-2012 11:48 PM
by aquariumjunky

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2

8,240

Cool

2000, 27t, audi, b5, bank, code, eggs, internal, limp, misfire, missfire, mode, p0421, p1131, plug, resistance, rotten, s4, smells, spark

S4 2.7t p1131

tannercortes on 03-30-2012

03-30-2012 09:54 PM
by tannercortes

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8

11,734

03, 2003, 2005, a4, audi, catalyst, catalytic, converter, cts, engine, esp, light, p0102, p0420, p0421, warm

Engine and ESP lights on (P0102, P0172, P0420, P0421)

romar1086 on 08-29-2011

01-03-2012 06:51 PM
by 20090401

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1

6,370

02, a4, a6, audi, bank, catalyst, cel, code, denver, effeciancy, emission, error, p0421, po421, test

CEL: Code P0421

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Multi-page thread

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saintforlife on 07-24-2007

10-26-2011 08:57 PM
by igortiger

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61

77,813

0304, 2001, 28, allroad, audi, b5, code, engine, p0304, p0421, quattro, s4, shift, shudder, tt

2001 Allroad shuddering p0304 code

Zeeborg on 06-18-2011

07-14-2011 09:33 PM
by carbonhornet

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5

5,077

Allroad Model Line

a4, air, audi, code, fault, fuel, p0421, ratio, rich

need code advice PLEASE!

mr_A6 on 05-31-2011

06-01-2011 08:35 AM
by padog

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2

1,163

2001, 27, 27t, a4, a6, audi, blocks, cat, clean, code, engine, measuring, p0421, po421, vag

help p0421 cat code what to do?

ratherb1 on 05-03-2011

05-03-2011 11:31 AM
by ratherb1

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0

5,261

00, 0421, 1131, 2000, a4, audi, audib5s4p0421, b5, b5s4, b5s4p0421, code, diagnostic, means, p0421, po421, s4

'00 B5 S4 with P0421

the24thletter on 04-16-2011

04-16-2011 02:08 PM
by the24thletter

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0

3,992

S Car Model Line

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